search for: vdostats

sorry corrections: For this test I created a 40GB lvm volume group with /dev/sdb and /dev/sdc then a 40GB LV then a 60GB VDO vol (for testing purposes) vdostats --verbose /dev/mapper/vdoas | grep -B6 'saving percent' output from just created vdoas [root at localhost ~]# vdostats --verbose /dev/mapper/vdoas | grep -B6 'saving percent' physical blocks : 10483712 logical blocks : 15728640 1K-blocks...

On May 3, 2020 8:33:33 AM GMT+03:00, Erick Perez - Quadrian Enterprises <eperez at quadrianweb.com> wrote: >sorry corrections: >For this test I created a 40GB lvm volume group with /dev/sdb and >/dev/sdc >then a 40GB LV >then a 60GB VDO vol (for testing purposes) > >vdostats --verbose /dev/mapper/vdoas | grep -B6 'saving percent' >output from just created vdoas > >[root at localhost ~]# vdostats --verbose /dev/mapper/vdoas | grep -B6 >'saving >percent' >physical blocks : 10483712 > logical blocks...

...ical volume contains three copies of essentially identical data, I should see deduplication numbers close to 3.00, but instead I'm seeing numbers like 1.15. I compute the compression number as follows: Use df and extract the value for "1k blocks used" from the third column use vdostats --verbose and extract the number titled "1K-blocks used" Divide the first by the second. Can you provide any advice on my use of ZFS or VDO without telling me that I should be doing backups differently? Thanks David

My two cents: 1- Do you have an encrypted filesystem on top of VDO? If yes, you will see no benefit from dedupe. 2- can you post the stats of vdostats ?verbose /dev/mapper/xxxxx (replace with your device) you can do something like: "vdostats -verbose /dev/mapper/xxxxxxxx | grep -B6 'save percentage' On Sat, May 2, 2020 at 9:54 PM david <david at daku.org> wrote: > Folks > > I'm looking for a solution for bac...

Folks I've started to use "vdo" instead of zfs in Centos 7. I hope this is a wise decision. However, I'm a bit mystified in decoding the "vdostats" output. I'd like to figure out how well deduplication is working. One measure would be to find two numbers: L = How many bocks are in use as reported to tools like df P = How many actual blocks are in use. Then a value such as L/P, which can never be less than 1, would be interes...

...logical volume contains three copies of essentially identical data, I should see deduplication numbers close to 3.00, but instead I'm seeing numbers like 1.15. I compute the compression number as follows: Use df and extract the value for "1k blocks used" from the third column use vdostats --verbose and extract the number titled "1K-blocks used" Divide the first by the second. Can you provide any advice on my use of ZFS or VDO without telling me that I should be doing backups differently? Thanks David _______________________________________________ CentOS mailing list...